Orbital angular momentum (OAM), which describes tailoring the spatial physical dimension of light waves into a helical phase structure, has given rise to many applications in optical manipulation, microscopy, imaging, metrology, sensing, quantum science, and optical communications.

2024年8月26日 · The phase memory of OAM is revealed as the ability of twisted light to preserve the initial helical phase even propagating through the turbid tissue-like multiple scattering medium.

2019年10月2日 · Akin to a fluid vortex with a central flow singularity, an optical vortex beam has a phase singularity with a certain topological charge, giving rise to a hollow intensity distribution. Such a...

2025年1月10日 · Achieving highly tailored control over both the spatial and temporal evolution of light’s orbital angular momentum (OAM) on ultrafast timescales remains a critical challenge in photonics. Here, we introduce a method to modulate the OAM of light on a femtosecond scale by engineering a space-time coupling in ultrashort pulses.

2021年10月27日 · Structured light, especially beams carrying orbital angular momentum (OAM), has gained much interest due to its unique amplitude and phase structures. In terms of communication systems, multiple orthogonal OAM beams can be potentially utilized for increasing link capacity in different scenarios.

2020年9月29日 · However, the transfer law of orbital angular momentum (OAM) during frequency conversion remains to be elucidated. Here, we demonstrate experimentally that OAM transfer depends strongly on the phase-matching condition defined by …

In this letter, a method of orbital angular momentum (OAM) mode conversion based on the principle of phase superposition is presented and analyzed. Utilizing this method, OAM waves can be modulated to a higher mode by secondary phase regulation on …

2024年2月5日 · In this study, we explore the impact of the astigmatism phase on the evolution of the phase singularity of an orbital angular momentum (OAM) beam propagating through free space. The results demonstrate that the high-order phase singularity dispersed into a cluster of individual unit phase singularities owing to the astigmatism phase.

2025年3月12日 · Experimentally, such beams can be produced by translating a phase plate used to generate OAM beams perpendicular to the incident Gaussian beam (Fig. 1c and Methods section 1.3) or by the coherent ...

In this Letter, a mode-matching method is proposed to identify the complex OAM spectrum with a Mach–Zehnder interferometer and a charge-coupled device camera. It has the potential to extend the...